<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>2.16</title>
</head>

<body>
    <script>
        const str = 'hello';
        console.log(str.at(1)); //"e"
        console.log(str.at(-1));    //"o"
    </script>
    </body>
    
    </html>